For Eclipse 3.5, to install from a zip file, download the zip and point your p2 installer to that file. Then proceed as if it were a normal update site.
For Eclipse 3.4, to install from a zip file,
see here
for how to do this.

Development builds for Eclipse 3.4

AJDT 2.0.1 dev builds for Eclipse 3.4
What is JDT weaving?
There is no schedule 2.0.2 release of AJDT for Eclipse 3.4.